Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1993-07-26
1994-11-08
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528 21, 528 26, 528 34, 528126, 528128, 528170, 528171, 528172, 528173, 528174, 528175, 528179, 528185, 528188, 528220, 528229, 528353, 524600, C08G 802, C08G 7310, C08G 6926
Patent
active
053628373
ABSTRACT:
Macrocyclic polyetherimide oligomer compositions are prepared by a displacement reaction at a temperature in the range of about 200.degree.-225.degree. C. between at least one fluorinated aromatic phthalimide and at least one phenolic trialkylsilyl ether compound. Preferably, a bis-fluoroimide and a bis-trialkylsilyl ether of a dihydroxyaromatic compound such as resorcinol are employed. The reaction is conducted by maintaining reagents A and B in high dilution in a dipolar aprotic organic liquid such as N-methylpyrrolidone, and in the presence of a catalytic amount of at least one substantially soluble fluoride. Preferably, a mixture of reagents A and B is added to solvent containing the catalyst.
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Bryant et al., "A-B Polyetherimides", Abstracts of the Fourth International Conference on Polyimides, pp. 69-71, Oct.30-Nov. 1, (1991).
Takekoshi Tohru
Terry Jane M.
Foelak Morton
General Electric Company
Hampton-Hightower P.
Pittman William H.
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